The first ever search for α decays to the first excited state in Yb was performed for six isotopes of hafnium (174, 176, 177, 178, 179, 180) using a high purity Hf sample of natural isotopic abundance with a mass of 179.8 g. For 179Hf, also α decay to the ground state of 175Yb was searched for thanks to the β-instability of the daughter nuclide 175Yb. The measurements were conducted using an ultra-low-background HPGe-detector system located 225 m underground. After 75 days of data taking no decays were detected but lower bounds for the half-lives of the decays were derived on the level of limT1/2∼1015−1018 a. The decay with the shortest half-life based on theoretical calculation is the decay of 174Hf to the first 2+ 84.3 keV excited level of 170Yb. The experimental lower bound was found to be T1/2≥3.3×1015 a.
DANEVICH F.A.;
HULT Mikael;
KASPEROVYCH Dima;
KOVTUN G.P.;
KOVTUN K.V.;
LUTTER Guillaume;
MARISSENS Gerd;
POLISCHUK Iksana;
STETSENKO S.P.;
TRETYAK V.I.;
2020-01-17
SPRINGER
JRC117550
1434-6001 (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC117550,
10.1140/epja/s10050-019-00005-x (online),
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